Emmanuele Bassi f911a3a7a1 Allow ensuring that a stage viewport is updated
Since we only update the GL viewport when we receive a ConfigureNotify
event on X11, we also need a function to allow other toolkits to tell
a stage that the viewport should be updated.

This commit adds clutter_stage_ensure_viewport(), a function that simply
sets the private SYNC_MATRICES flag on the stage and then queues a
redraw.

This function should be called by libraries integrating Clutter with
other toolkits, like clutter-gtk or clutter-qt.
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